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<body class="bg-gray-50">
    <!-- Hero Section -->
    <section class="hero-gradient text-white py-20 md:py-32 px-4">
        <div class="container mx-auto max-w-4xl">
            <div class="text-center">
                <span class="inline-block px-3 py-1 text-xs font-semibold bg-white text-blue-600 rounded-full mb-4">技术深度解析</span>
                <h1 class="text-4xl md:text-5xl font-bold mb-6 font-serif">Spring事件机制深度解析</h1>
                <p class="text-xl md:text-2xl opacity-90 max-w-3xl mx-auto">探索Spring框架中的发布-订阅模式实现原理与应用实践</p>
                <div class="mt-10 flex justify-center space-x-4">
                    <a href="#core-concept" class="px-6 py-3 bg-white text-blue-600 font-medium rounded-lg hover:bg-blue-50 transition-all">
                        <i class="fas fa-lightbulb mr-2"></i>核心概念
                    </a>
                    <a href="#implementation" class="px-6 py-3 border-2 border-white text-white font-medium rounded-lg hover:bg-white hover:bg-opacity-10 transition-all">
                        <i class="fas fa-code mr-2"></i>实现流程
                    </a>
                </div>
            </div>
        </div>
    </section>

    <!-- Main Content -->
    <div class="container mx-auto max-w-5xl px-4 py-16">
        <!-- Introduction -->
        <section class="mb-20">
            <div class="drop-cap text-gray-700 mb-8 text-lg">
                Spring 事件机制是 Spring 框架的一个重要特性，它基于发布-订阅模式实现。通过事件机制，应用的不同部分可以相互通信而不直接依赖于彼此。这种机制通常用来解耦各个组件之间的关系，使得各个模块的功能更加独立。
            </div>
            <div class="grid md:grid-cols-2 gap-8">
                <div class="bg-white p-8 rounded-xl shadow-md card-hover transition-all">
                    <div class="flex items-center mb-4">
                        <div class="w-10 h-10 rounded-full bg-blue-100 flex items-center justify-center text-blue-600 mr-4">
                            <i class="fas fa-paper-plane text-xl"></i>
                        </div>
                        <h3 class="text-xl font-bold">事件发布者</h3>
                    </div>
                    <p class="text-gray-600">负责发布事件的组件，通过ApplicationContext发布事件，无需直接依赖监听器。</p>
                </div>
                <div class="bg-white p-8 rounded-xl shadow-md card-hover transition-all">
                    <div class="flex items-center mb-4">
                        <div class="w-10 h-10 rounded-full bg-purple-100 flex items-center justify-center text-purple-600 mr-4">
                            <i class="fas fa-headphones text-xl"></i>
                        </div>
                        <h3 class="text-xl font-bold">事件监听器</h3>
                    </div>
                    <p class="text-gray-600">监听并响应特定事件的组件，实现ApplicationListener接口来处理业务逻辑。</p>
                </div>
            </div>
        </section>

        <!-- Core Concepts -->
        <section id="core-concept" class="mb-20">
            <h2 class="text-3xl font-bold mb-8 font-serif flex items-center">
                <span class="w-8 h-8 rounded-full bg-blue-100 text-blue-600 flex items-center justify-center mr-4">
                    <i class="fas fa-cog"></i>
                </span>
                Spring 事件机制的核心类
            </h2>
            
            <div class="bg-white rounded-xl shadow-md overflow-hidden mb-10">
                <div class="grid md:grid-cols-2 divide-y md:divide-y-0 md:divide-x divide-gray-200">
                    <div class="p-8">
                        <h3 class="text-xl font-bold mb-4 text-blue-600">基础类与接口</h3>
                        <ul class="space-y-4">
                            <li class="flex items-start">
                                <span class="inline-flex items-center justify-center w-6 h-6 rounded-full bg-blue-100 text-blue-600 text-sm font-bold mr-3 mt-1">1</span>
                                <div>
                                    <h4 class="font-semibold">ApplicationEvent</h4>
                                    <p class="text-gray-600 text-sm">所有事件的基类，自定义事件需要继承此类</p>
                                </div>
                            </li>
                            <li class="flex items-start">
                                <span class="inline-flex items-center justify-center w-6 h-6 rounded-full bg-blue-100 text-blue-600 text-sm font-bold mr-3 mt-1">2</span>
                                <div>
                                    <h4 class="font-semibold">ApplicationListener</h4>
                                    <p class="text-gray-600 text-sm">事件监听器接口，实现onApplicationEvent方法</p>
                                </div>
                            </li>
                            <li class="flex items-start">
                                <span class="inline-flex items-center justify-center w-6 h-6 rounded-full bg-blue-100 text-blue-600 text-sm font-bold mr-3 mt-1">3</span>
                                <div>
                                    <h4 class="font-semibold">ApplicationEventPublisher</h4>
                                    <p class="text-gray-600 text-sm">事件发布者接口，通常由ApplicationContext实现</p>
                                </div>
                            </li>
                        </ul>
                    </div>
                    <div class="p-8">
                        <h3 class="text-xl font-bold mb-4 text-purple-600">关键实现类</h3>
                        <ul class="space-y-4">
                            <li class="flex items-start">
                                <span class="inline-flex items-center justify-center w-6 h-6 rounded-full bg-purple-100 text-purple-600 text-sm font-bold mr-3 mt-1">1</span>
                                <div>
                                    <h4 class="font-semibold">SimpleApplicationEventMulticaster</h4>
                                    <p class="text-gray-600 text-sm">默认的事件多播器实现，负责分发事件</p>
                                </div>
                            </li>
                            <li class="flex items-start">
                                <span class="inline-flex items-center justify-center w-6 h-6 rounded-full bg-purple-100 text-purple-600 text-sm font-bold mr-3 mt-1">2</span>
                                <div>
                                    <h4 class="font-semibold">AnnotationConfigApplicationContext</h4>
                                    <p class="text-gray-600 text-sm">常用的ApplicationContext实现，支持注解配置</p>
                                </div>
                            </li>
                        </ul>
                    </div>
                </div>
            </div>

            <h3 class="text-2xl font-bold mb-6 mt-12 font-serif">代码示例</h3>
            <div class="grid md:grid-cols-2 gap-8">
                <div>
                    <div class="flex items-center mb-3">
                        <div class="w-8 h-8 rounded-full bg-blue-100 text-blue-600 flex items-center justify-center mr-3">
                            <i class="fas fa-file-code"></i>
                        </div>
                        <h4 class="font-bold">自定义事件类</h4>
                    </div>
                    <pre class="p-4 overflow-auto"><code class="language-java">public class MyEvent extends ApplicationEvent {
    private String message;

    public MyEvent(Object source, String message) {
        super(source);
        this.message = message;
    }

    public String getMessage() {
        return message;
    }
}</code></pre>
                </div>
                <div>
                    <div class="flex items-center mb-3">
                        <div class="w-8 h-8 rounded-full bg-blue-100 text-blue-600 flex items-center justify-center mr-3">
                            <i class="fas fa-list"></i>
                        </div>
                        <h4 class="font-bold">监听器接口定义</h4>
                    </div>
                    <pre class="p-4 overflow-auto"><code class="language-java">public interface ApplicationListener&lt;E extends ApplicationEvent&gt; {
    void onApplicationEvent(E event);
}</code></pre>
                </div>
            </div>
        </section>

        <!-- Implementation Flow -->
        <section id="implementation" class="mb-20">
            <h2 class="text-3xl font-bold mb-8 font-serif flex items-center">
                <span class="w-8 h-8 rounded-full bg-green-100 text-green-600 flex items-center justify-center mr-4">
                    <i class="fas fa-project-diagram"></i>
                </span>
                事件发布与监听的实现流程
            </h2>

            <div class="mb-12">
                <div class="mermaid">
                    sequenceDiagram
                        participant Publisher as 事件发布者
                        participant Context as ApplicationContext
                        participant Multicaster as EventMulticaster
                        participant Listener as 事件监听器

                        Publisher->>Context: publishEvent(myEvent)
                        Context->>Multicaster: multicastEvent(myEvent)
                        Multicaster->>Listener: onApplicationEvent(myEvent)
                        Listener-->>Multicaster: 处理完成
                </div>
            </div>

            <div class="relative">
                <div class="absolute left-0 md:left-1/2 h-full w-1 bg-gray-200 transform -translate-x-1/2"></div>
                
                <div class="grid grid-cols-1 md:grid-cols-2 gap-8">
                    <!-- Left Column -->
                    <div class="md:pr-12">
                        <div class="relative pl-12 mb-12 timeline-item">
                            <h3 class="text-xl font-bold mb-4">1. 事件发布</h3>
                            <p class="text-gray-600 mb-4">组件通过ApplicationContext发布事件，调用publishEvent()方法</p>
                            <div class="highlight-box p-4 mb-4">
                                <pre class="text-sm"><code class="language-java">context.publishEvent(new MyEvent(this, "Hello"));</code></pre>
                            </div>
                        </div>

                        <div class="relative pl-12 mb-12 timeline-item">
                            <h3 class="text-xl font-bold mb-4">3. 监听器响应</h3>
                            <p class="text-gray-600 mb-4">监听器实现onApplicationEvent方法处理业务逻辑</p>
                            <div class="highlight-box p-4">
                                <pre class="text-sm"><code class="language-java">@Override
public void onApplicationEvent(MyEvent event) {
    System.out.println("Received: " + event.getMessage());
}</code></pre>
                            </div>
                        </div>
                    </div>
                    
                    <!-- Right Column -->
                    <div class="md:pl-12 md:pt-20">
                        <div class="relative pl-12 mb-12 timeline-item">
                            <h3 class="text-xl font-bold mb-4">2. 事件分发</h3>
                            <p class="text-gray-600 mb-4">ApplicationEventMulticaster将事件广播给所有监听器</p>
                            <div class="highlight-box p-4">
                                <pre class="text-sm"><code class="language-java">public void multicastEvent(ApplicationEvent event) {
    for (ApplicationListener listener : listeners) {
        listener.onApplicationEvent(event);
    }
}</code></pre>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </section>

        <!-- Pros & Cons -->
        <section class="mb-20">
            <h2 class="text-3xl font-bold mb-8 font-serif flex items-center">
                <span class="w-8 h-8 rounded-full bg-yellow-100 text-yellow-600 flex items-center justify-center mr-4">
                    <i class="fas fa-balance-scale"></i>
                </span>
                Spring 事件机制的优缺点
            </h2>
            
            <div class="grid md:grid-cols-2 gap-8">
                <div class="bg-green-50 border border-green-100 rounded-xl p-8">
                    <div class="flex items-center mb-4">
                        <div class="w-10 h-10 rounded-full bg-green-100 flex items-center justify-center text-green-600 mr-4">
                            <i class="fas fa-thumbs-up text-xl"></i>
                        </div>
                        <h3 class="text-xl font-bold">优势</h3>
                    </div>
                    <ul class="space-y-3">
                        <li class="flex items-start">
                            <i class="fas fa-check-circle text-green-500 mt-1 mr-2"></i>
                            <span><strong>解耦合</strong>：发布者与监听者之间无直接依赖，系统组件更加松耦合</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check-circle text-green-500 mt-1 mr-2"></i>
                            <span><strong>灵活性</strong>：易于扩展和修改事件发布与响应逻辑</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check-circle text-green-500 mt-1 mr-2"></i>
                            <span><strong>异步支持</strong>：可通过异步事件处理提高系统响应速度</span>
                        </li>
                    </ul>
                </div>
                
                <div class="bg-red-50 border border-red-100 rounded-xl p-8">
                    <div class="flex items-center mb-4">
                        <div class="w-10 h-10 rounded-full bg-red-100 flex items-center justify-center text-red-600 mr-4">
                            <i class="fas fa-exclamation-triangle text-xl"></i>
                        </div>
                        <h3 class="text-xl font-bold">劣势</h3>
                    </div>
                    <ul class="space-y-3">
                        <li class="flex items-start">
                            <i class="fas fa-times-circle text-red-500 mt-1 mr-2"></i>
                            <span><strong>性能开销</strong>：大量事件和监听器可能带来性能负担</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-times-circle text-red-500 mt-1 mr-2"></i>
                            <span><strong>调试困难</strong>：事件驱动模式使执行流程不易追踪</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-times-circle text-red-500 mt-1 mr-2"></i>
                            <span><strong>复杂度</strong>：不当使用可能导致系统复杂度增加</span>
                        </li>
                    </ul>
                </div>
            </div>
        </section>

        <!-- Complete Example -->
        <section class="mb-20 bg-white rounded-xl shadow-md overflow-hidden">
            <div class="p-8 border-b border-gray-200">
                <h2 class="text-2xl font-bold flex items-center">
                    <span class="w-8 h-8 rounded-full bg-indigo-100 text-indigo-600 flex items-center justify-center mr-4">
                        <i class="fas fa-laptop-code"></i>
                    </span>
                    完整示例代码
                </h2>
            </div>
            <div class="p-8">
                <div class="grid md:grid-cols-2 gap-8">
                    <div>
                        <h3 class="text-xl font-bold mb-4 flex items-center">
                            <i class="fas fa-paper-plane text-blue-500 mr-2"></i>
                            事件发布者
                        </h3>
                        <pre class="p-4 overflow-auto text-sm"><code class="language-java">@Component
public class MyEventPublisher {
    @Autowired
    private ApplicationContext context;

    public void publishEvent(String message) {
        MyEvent event = new MyEvent(this, message);
        context.publishEvent(event);
    }
}</code></pre>
                    </div>
                    <div>
                        <h3 class="text-xl font-bold mb-4 flex items-center">
                            <i class="fas fa-headphones text-purple-500 mr-2"></i>
                            事件监听器
                        </h3>
                        <pre class="p-4 overflow-auto text-sm"><code class="language-java">@Component
public class MyEventListener implements ApplicationListener&lt;MyEvent&gt; {
    @Override
    public void onApplicationEvent(MyEvent event) {
        System.out.println("Received event: " + event.getMessage());
    }
}</code></pre>
                    </div>
                </div>
                
                <div class="mt-8">
                    <h3 class="text-xl font-bold mb-4 flex items-center">
                        <i class="fas fa-play-circle text-green-500 mr-2"></i>
                        测试用例
                    </h3>
                    <pre class="p-4 overflow-auto text-sm"><code class="language-java">public class EventTest {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = 
            new AnnotationConfigApplicationContext();
        
        context.register(MyEventListener.class);
        context.refresh();

        MyEventPublisher publisher = context.getBean(MyEventPublisher.class);
        publisher.publishEvent("Hello, Spring Event!");

        context.close();
    }
}</code></pre>
                </div>
            </div>
        </section>
    </div>

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